Hat Island is an uninhabited island located in the Qikiqtaaluk Region of Nunavut, Canada. It is situated in Eureka Sound at the confluence of Bay Fjord, east of Ellesmere Island's Raanes Peninsula, and 19.6 km (12.2 mi) west of Stor Island. It is a member of the Sverdrup Islands group and the Canadian Arctic Archipelago. It is also a member of the Queen Elizabeth Islands and the Canadian Arctic Archipelago.
Another, bigger (about 4 × 8 km) Hat Island is also in Nunavut.